It is one of the most common questions we are asked, and it deserves an honest answer rather than a sales line. Do blinds genuinely reduce your energy bills, or is it just something companies say?
The short version: yes, the right blinds make a measurable difference, and there is independent laboratory evidence to prove it. The longer version is more interesting, because not all blinds perform the same way, and the gap between the best and the worst is large enough to matter on your heating bill.
Windows are the weakest point in almost every home’s thermal envelope. A wall keeps the heat in; a pane of glass lets it pour out. In a Jersey home, where granite cottages and single-skin coastal walls are common and the south-westerly wind never really stops, the heat you pay for has a habit of finding the glass and leaving through it. The right window treatment slows that down. Here is what the research actually shows.
The Evidence: What the Energy House Study Found
The most rigorous testing on this question comes from the University of Salford’s Energy House, a full-size Victorian terraced house built inside an environmental chamber that can recreate everything from a still summer evening to a minus-twelve winter gale under controlled conditions. The British Blind and Shutter Association commissioned independent testing of five shading products on an energy-efficient double-glazed window.
The headline finding: the best-performing blind reduced heat loss through the window by 33 per cent. The full set of results is worth seeing, because it shows just how much the type of blind and the quality of the fit matter.
| Product tested | Heat loss reduction |
|---|---|
| Roller blind with zip side channels and low-emissivity fabric | 33% |
| Blockout honeycomb blind in a framed bead-fit system | 32% |
| Internal plantation shutters | 28% |
| Roller blind with side channels | 22% |
| Standard roller blind (no side channels) | 13% |
Two lessons jump straight out. First, even a plain roller blind cuts heat loss by an eighth, simply by trapping a buffer of still air against the glass. Second, the way a blind is fitted matters as much as the fabric. The same roller blind goes from 13 per cent to 22 per cent the moment you add side channels that close the gap at the edges, and to 33 per cent with a low-emissivity fabric. The study also notes that on older single-glazed or early double-glazed windows, common in Jersey’s period properties, the savings are higher still, because there is more heat loss to prevent in the first place.
Why Honeycomb Blinds Are the Standout
If energy efficiency is your priority, honeycomb blinds (also called cellular shades) are the product to know about. Their design is the reason they performed so strongly in the Salford testing.
Look at a honeycomb blind end-on and you see exactly how it works: rows of hexagonal pockets that trap a layer of still air between the room and the window. Still air is one of the best insulators there is, which is the same principle behind double glazing and a winter coat. That trapped layer slows the movement of heat in both directions.
The numbers back it up. Independent figures from the US Department of Energy credit insulated cellular shades with reducing heat loss through windows by 40 per cent or more in winter, and cutting unwanted solar heat gain by up to 60 per cent in summer. In insulation terms, a double-cell honeycomb blind can roughly double the thermal resistance of the window it covers. That is a genuine year-round benefit: warmer rooms in winter, cooler rooms in summer, and a heating and cooling system that works less hard to hold the temperature.
There is a quieter benefit too. Honeycomb fabric diffuses harsh sunlight into soft, even light, so the rooms that save you the most energy are also the most comfortable to sit in. That is the design-led way of thinking about efficiency: the practical and the beautiful coming from the same product.
It Is Not Only About Winter Heating
The energy conversation usually starts with keeping heat in, and if your priority is a warm home through the coldest months, our guide to the best blinds to keep your home warm in winter covers that in detail. But in a sunny Jersey home, keeping heat out is just as important. The island recorded over 2,127 hours of sunshine in 2024, more than anywhere else in the British Isles, and a south or west-facing room can overheat badly in summer. When that happens, fans and air conditioning start adding to your bills at exactly the time of year you expected a break from them.
Blinds work both ways. The same cellular structure that holds warmth in during winter reflects and blocks solar heat during summer, with cellular shades cutting unwanted solar gain by up to 60 per cent when fitted with a close fit. Light-coloured fabrics, solar-reflective coatings, and external shading all reduce the load further. For conservatories and sun rooms, which can become unusable in July, the right conservatory blinds are the difference between a room you avoid for two months a year and one you enjoy all year round.
If you want the room-by-room view of staying comfortable without the running costs, our guide to the best blinds for every room maps the options to where you actually live.
How Much Could You Save, Realistically?
This is where honesty matters more than headline figures. A blind that cuts heat loss through a window by 33 per cent does not cut your whole heating bill by 33 per cent, because the window is only one part of the home losing heat. What it does is reduce the share of heat escaping through your glazing, which is one of the largest single weak points in the building.
Independent figures put the total energy saving from quality cellular shades at up to around 15 per cent of heating and cooling costs across a home that fits them well, with the biggest gains in rooms with large windows, older glazing, or heavy exposure. The payback is gradual rather than instant, but it compounds every year the blinds are in your home, and it sits alongside benefits that do not show up on a meter at all: fewer draughts, less glare, a more even temperature, and rooms that simply feel better to be in.
There is also a Jersey-specific point worth making. Because we manufacture many of our products at our St John workshop, the supply chain behind your blinds is short. Materials are made and finished on-island rather than shipped across a continent. Fewer transport miles, less packaging, and local production help reduce environmental impact while supporting Jersey craftsmanship and skills. It is a practical, measurable form of sustainability that benefits both our customers and the island community.
Getting the Most From Energy-Efficient Blinds
The research is clear that the fit matters as much as the fabric. A few principles make the difference between a blind that saves energy and one that mostly just looks the part.
Close the gaps. The biggest jump in the Salford results came from side channels that seal the edges of the blind against the window frame. A blind that leaves a gap at the sides lets warm air slip past the edges and circulate against the cold glass. Made-to-measure fitting, sealed into or just beyond the recess, is what closes those gaps.
Choose the structure for the job. Honeycomb for maximum insulation, shutters for permanent thermal mass and property value, low-emissivity roller fabrics where you want a clean, minimal look that still performs. Each has its place.
Let automation do the work. Motorised blinds on a dawn or dusk schedule close automatically to trap heat on winter evenings and shade the glass during the summer peak, without you having to think about it. Automated sun-tracking turns an energy-efficient blind into one that is always in the right position.
Think about the whole room. The rooms with the most glass, the oldest windows, and the heaviest sun exposure are where efficient blinds pay back fastest. A consultation that looks at the whole home tells you where to start.
Frequently Asked Questions
Do blinds really keep heat in?
Yes. Independent testing at the University of Salford’s Energy House found that the right blinds reduce heat loss through a window by up to 33 per cent, with even a standard roller blind cutting it by around 13 per cent. Blinds work by trapping a layer of still air against the glass, which slows the movement of heat. The effect is greater on older single-glazed and early double-glazed windows.
Which blinds are the most energy efficient?
Honeycomb (cellular) blinds are the standout for insulation, thanks to the pockets of trapped air in their structure, and they performed at 32 per cent heat-loss reduction in the Salford testing. Plantation shutters and roller blinds with sealed side channels also perform strongly. The fit matters as much as the fabric: closing the gaps at the edges of the blind makes a measurable difference.
How much can blinds save on my energy bills?
Quality cellular shades fitted well across a home can save in the region of 15 per cent of heating and cooling costs, with the biggest gains in rooms that have large windows, older glazing, or heavy sun exposure. The exact saving depends on your home, but the benefit compounds every year and comes alongside fewer draughts, less glare, and more even temperatures.
Do blinds help keep a room cool in summer?
They do. Cellular shades can cut unwanted solar heat gain through windows by up to 60 per cent when fitted with a close fit, which keeps south and west-facing rooms noticeably cooler and reduces the need for fans and cooling. In conservatories and sun rooms, the right blinds are often the difference between a usable room and one too hot to enjoy.
Are energy-efficient blinds worth the cost?
For rooms with significant glazing or exposure, yes. The energy saving is gradual but recurring, and it sits alongside comfort benefits that do not appear on a bill. A free home consultation will tell you which rooms in your home benefit most, so you can prioritise where the investment works hardest.
Want to know which rooms in your home would benefit most? Book a free home consultation. We assess each room for glazing, exposure, and heat loss, then recommend the specification that gives you the best return in comfort and running costs. No obligation, just expert advice from Jersey’s longest-established blind manufacturer.
